| dc.description |
The reaction of polymeric [{Mo(NO)2Cl2}n] with ligands L or L2[L = MeCN, CH2.dbd6;CHCN, PhCN, PPh3, or pyridine; L2= 2,2â ²-bipyridine (bipy) or 1,2-bis(diphenylphosphino)ethane] affords neutral monomenc [Mo(NO)2L2Cl2] in high yield. The structure of [Mo(NO)2(bipy)Cl2] has been determined by X-ray diffraction. The compound crystallises in the monoclinic space group P21/c with a= 8.1 42(3), b= 16.383(6), c= 11.948(3)à , β= 121.43(4)°, and Z= 4. The structure was solved by conventional Patterson and Fourier methods to a conventional R= 0.045, Râ ²= 0.050 for 1 687 independent reflections having |F o|<sup>2</sup> > 3Ï |F o|<sup>2</sup>. The crystal structure consists of well separated, discrete molecules. The co-ordination geometry around the molybdenum is described as distorted octahedral with cis-dinitrosyl-trans-dichloro-stereochemistry. The two NO groups are ordered and nearly linear [Moâ Nâ O = 175.9(10) and 177.4(13)°]. The characterization of all of the dinitrosylmolybdenum complexes by vibrational, <sup>1</sup>H and <sup>31</sup>P n.m.r., and u.v.â visible spectroscopy is described. From a comparison of the spectroscopic studies with the X-ray structures of [Mo(NO)2(bipy)Cl2] and the other known compound [Mo(NO)2(PPh3)2Cl2], two kinds of stereochemistry are formed cis-dinitrosyl-trans-dichloro and cis-dinitrosyl-cis-dichloro. |
